Metal frame for doorways

ABSTRACT

An inverted U-shaped sheet metal frame has six main parts, two front jamb parts, two rear jamb parts, and front and rear header parts. Each main part has snap fastener projections to receive a trim strip part, making twelve parts total. Each jamb and header part has a wall engaging flange and a transverse flange which is disposed in the doorway opening. The wall flanges are nailed to the wall and the transverse flanges overlap variably. The front frame parts have door stop ribs along the edges of their transverse flanges and transverse clips or longitudinal strips welded in bridging relation to the back sides of the stop ribs to slidably receive the free edges of the transverse flanges on the rear parts. The header parts have tongues received in loops struck from the upper ends of the jamb parts. The front jamb and header parts have oppositely vertically overlapping projections that prevent the header part from twisting on the jamb parts during erection. A modification combines opposed duplicate front jamb and header parts with parting strips welded to one end projecting therebetween to produce a door frame for dual doors opening oppositely from the frame.

United States Patent Herr et a1.

[75] Inventors: Theodore Z. Herr, Highland Park,

111.; Daniel J. McClure, Clarksville,

[451 May 20, 1975 1,167,975 10/1969 United Kingdom ..52/213 1,954,745 5/1971 Germany ..52/204 Primary Examiner-Frank L. Abbott Assistant ExaminerLeslie A. Braun Attorney, Agent, or Firm-Austin A. Webb [57] ABSTRACT An inverted U-shaped sheet metal frame has six main parts, two front jamb parts, two rear jamb parts, and front and rear header parts. Each main part has snap fastener projections to receive a trim strip part, making twelve parts total. Each jamb and header part has a wall engaging flange and a transverse flange which is disposed in the doorway opening. The wall flanges are nailed to the wall and the transverse flanges overlap variably. The front frame parts have door stop ribs along the edges of their transverse flanges and transverse clips or longitudinal strips welded in bridging relation to the back sides of the stop ribs to slidably receive the free edges of the transverse flanges on the rear parts. The header parts have tongues received in loops struck from the upper ends of the jamb parts. The front jamb and header parts have oppositely vertically overlapping projections that prevent the header part from twisting on the jamb parts during erection. A modification combines opposed duplicate front jamb and header parts with parting strips welded to one end projecting therebetween to produce a door frame for dual doors opening oppositely from the frame.

14 Claims, 19 Drawing Figures Mich.

[73] Assignee: Leigh Products Inc., Grand Rapids,

Mich.

[22] Filed: May 29, 1973 [21] Appl. No.: 364,930

[52] U.S. C1. 52/212; 52/214; 52/217 [51] Int. Cl. E06b 1/20 [58] Field of Search 52/212, 204, 211, 213, 52/214, 217; 49/505 [56] References Cited UNITED STATES PATENTS 1,048,988 12/1912 Mayo 49/505 X 1,913,716 6/1933 Meilink et a1 52/217 X 1,995,764 3/1935 Bohnsack 52/217 X 2,742,117 4/1956 Tolman 52/213 X 2,843,232 7/1958 Goldberg... 52/211 2,853,161 9/1958 Mascari 52/217 X 2,913,777 11/1959 Viets 49/505 3,107,759 10/1963 Day et a1. 52/212 3,156,331 11/1964 Sklar 49/505 X 3,269,068 8/1966 King 52/217 3,364,642 l/1968 Blickman 52/204 X 3,401,487 9/1968 Brandt et a1. 49/505 X 3,457,686 7/1969 Henson 52/217 X 3,690,082 9/1972 Byland 52/213 FOREIGN PATENTS OR APPLICATIONS 1,805,629 9/1969 Germany 52/217 PATENTEU W20 1975 SHEET 10? 6 FATE N TH] W2 0 I975 SHEET 20F 6 62 I L/ I J| I g I] 1 l l l [5 l+ 1 I {H 40.. wan wry u" I V I I: 5

FLJEMEMAY201QI5 SHEEI 5 BF 6 llllllllllllll METAL FRAME FOR DOORWAYS PRIOR ART Representative prior art is disclosed by US. Pat. Nos. 3,375,627 to Bursiek, 3,248,833 to Sklar, 3.690,082 to Byland and 3,107,759 to Day.

OUTLINE OF INVENTION The invention is directed to a simplification of prior metal door frames in which opposed parts are held in position by direct fastening to the wall surfaces; and in which adjacent frame parts are held together during erection, with opposed parts fitting slidably together to accommodate or be adaptable to walls of different thicknesses. The header parts are restrained against twisting relative to the jamb parts during erection and all connections are concealed when the frame is installed. One novel feature is a slidable friction grip connection between the front and back parts, and a cooperating feature is an improved and reinforced tongue and slot connection that holds the parts together at the corners both during and after assembly.

All parts are formed as metal stampings and due to the rigidifying connections can be made of relatively thin gauge metal. Also, the slidable engagement between the front and back parts permits a few standardized parts to be assembled into finished door jamps in wall openings of different thicknesses. Parts used to form a jamb with a single door stop rib can be combined to form a jamb with front and rear door stops for opposed or double door installations.

DESCRIPTION The drawings, of which there are six sheets, illustrate a preferred form of frame orjamb for a single door, and a modified adaptation of the parts to accommodate two side by side double doors.

FIG. 1 is an elevational view of a doorway with the frame of the invention in place therein.

FIG. 2 is an enlarged fragmentary elevational view of the front corners of the frame, with part of the trim elements removed.

FIG. 3 is a fragmentary top plan view of the frame parts shown in FIG. 2.

FIG. 4 is a top plan view of one end of the front header part shown in FIGS. 2 and 3.

FIG. 5 is a projected front elevational view of FIG. 4.

FIG. 6 is a projected end elevational view of FIG. 5.

FIG. 7 is a cross sectional view along the line 7--7 in FIG. 2 showing the snap fit of the trim strips.

FIG. 8 is a fragmentary rear elevational view showing the rear parts of the frame in elevation.

FIG. 9 is a fragmentary outside elevational view of the rear jamb part and the end of the rear header part shown in FIG. 8.

FIG. 10 is a side elevational view of the rear jamb part on a reduced scale.

FIG. 11 is a cross sectional view along the line 1111 in FIG. 1 showing one of the transverse retain ing clips on the front jamb part.

FIG. 12 is a projected side elevation of the clip in FIG. 11. v

FIG. 13 is an inside elevation of the jamb part with the clip thereon.

FIG. 14 is a fragmentary top elevation at an enlarged scale of the connection between the ends of the front header and front jamb parts.

FIG. 15 is a fragmentary projected side elevational view of the connection in FIG. 14. 0

FIG. 16 is an enlarged cross sectional view along the line 1616 in FIGS. 2 & 5 showing details of the connecting tongue on the front header part and the coacting relation of the front jamb parts.

FIG. 17 is a horizontal cross sectional view through a modified arrangement of jamb parts for a communicating or double door-way frame.

FIG. 18 is a view similar to FIG. 17 showing a further modified form of the jamb parts arranged to fit in a door opening in a thicker wall.

FIG. 19 is a fragmentary exploded side or outside edge elevational view of modified front and rear jamb and header parts in opposed relation ready for installation.

FIG. 1 shows a doorway frame according to the invention. The frame consists of twelve major parts which consist of a left front jamb part 20, right front 20 jamb part 22, front header part 24 and finish trim strips 26, 28 and 30 for each part. Corresponding rear jamb parts 32 and 34 and a rear header 36 appear in other views and have similar trim strips. The terms front and rear are relative only and the parts can be reversed.

Each front jamb part 20 and 22 has a flat wall engaging flange 38 and a transversely extending flange 40 lapped along the side of the door opening in the wall. The flanges 40 terminate in reversely bent door stop forming flanges 42 of rectangular cross section and terminating in forwardly turned flanges 44 in the planes of flanges 40. The front header part has a corresponding wall engaging flange 46 which extends across the upper ends of flanges 38, and a transversely extending flange 48. The mid-section of flange 48 is formed into a stop rib 50 of rectangular cross section that abuts at its ends against the door stop flanges 42.

The rear jamb parts 32 and 34, shown in greater detail in FIGS. 8, 9 and 10, have wall engaging flanges 52 and transversely extending flanges 54. The rear header part 36 has a wall engaging flange 56 and a transversely extending flange 58. The edges of flanges 54 on the rear jamb parts are notched as at 60 to clear hinge mounting and other hardware recesses formed in the transverse flanges 40 on the front jamb parts 20. The expedient of recessing metal door frames for hinge and lock hardware is old and so is not disclosed in greater detail.

CONNECTING STRUCTURE Various connecting elements are duplicated on the several major parts. All of the wall engaging flanges ,have outwardly angled edge flanges 62 along their outer edges. These may be continuous as shown in FIGS. 1 to 18, or may be interrupted as shown in FIG. 19. Just inwardly of the edge flanges, the wall engaging flanges are provided with a series of holes 64 through which nails or screws 66 may be passed to secure the parts to the wall around the door opening as is shown in dotted lines in FIG. 3. The interruptions 65 in the flanges 62A in FIG. 19 are provided opposite the holes 64 to prevent the flanges from being damaged during careless nailing of the frame parts to the rough door framing. Just inwardly of the holes 64, the wall engaging flanges of the frame members have a series of longitudinally spaced dome shaped protrusions 68 stamped therefrom. The protrusions have longitudinally extending free edges 70 with central retaining tabs or cars 72 that project toward the door opening. The ears have a snap or interlocking engagement with a reversely turned or rolled rib 74 formed along the inner edges of the trim strips, as is shown in greater detail in FIG. 7. The trim strips are of generally U-shaped cross section with inturned flanges 76 along their outer edges which fit under the edge flanges 62 of the main structural parts of the frame. The U-shaped contour of the trim strips conceal the nails 66 and the protrusions 68, while the reversely rolled rib 74 on the inner edge flange 78 engages under the tabs or ears 72.

The ends of the header parts which project across the tops of the jamb parts have tabs generally indicated at 80 which project downwardly through loops formed by bands 82 struck from the ends of the jamb parts. Bands 82 are struck from both ends of the jamb parts so the jamb parts are reversible between right and left hand sides.

The tabs 80 are extensions from arcuate raised embossments 84 which are formed in the wall engaging flanges 46 and 56. These and the corresponding curved cross section of the tabs stiffens the tabs. When the tabs are engaged with the ends of the jamb parts, the otherwise generally flat projecting ends of the header parts are in turn stiffened against flexing by the jamb parts which are of right angle section at their ends. The tabs 80 and embossments 84 are offset two times the thickness of the metal of the headers, and the corners 86 of the tabs where they join the header are offset once the thickness of the metal to stiffen the corners and widen the engagement of the vertical edges of the tabs with the end folds of the bands 80. The lower ends of the tabs are slit on each side as at 88 and the side edges of the tabs are bent outwardly in springable catches 90 that engage under the bands 82 when assembled.

The ends of the door stop rib 50 on the front header part have small longitudinally projecting lugs 92 (see FIGS. 3 and 14) which engage over the ends of the door stop flanges 42 on the front jamb parts when assembled. This prevents downward twisting of the transverse flange of the front header, relative to the connection at the front tab 80 during assembly. In order to prevent reverse or upward twisting a U-shaped spring clip 94 is slipped over the upper edge of the door stop rib 20 on the front jamb part after the header and jamb are assembled. The lower edge of the clip bears against the base of the door stop rib 50 on the header and acts in opposition to the lug 92. As a further preliminary stiffening expedient, the ends of the transverse flange 48 of the front header is cut away as at 96 (see FIGS. 4 and 14) where the flange passes beyond the door stop rib or flanges 42. A tab 98 spaced from the header stop rib 50 by a slot 100 is left on the transverse flange and is bent down as in FIG. 15 after assembly. The tab thus prevents rotation of the header part around the upper end of the front jamb part, and also hold the transverse flange of the header in overlapped relation to the stop rib on the front jamb.

The rear jamb and header parts have the same end tab 80 and strap 82 connections as the front parts, but since each of the transverse flanges 54 and 58 are flat, straps 102 are slit and bent out of the planes of flanges 54, and ears or tabs 104 bent down from the ends of transverse flanges 58 are slipped through them when assembling the rear jamb and header parts. I

The transverse flanges 58 and 54 on the rear jamb and header pans slide transversely of the door opening behind the U-shaped door stop ribs 42 and 50 on the front jambs and headers. To hold the flanges and ribs in snug engagement and to permit variable spacing of the front and rear parts for walls of different thicknesses,the front jamb parts and header carry clips 106. As appears most clearly in FIGS. 11,12 and 13, the clips are metal stampings of generally U-shaped cross section with outturned flanges 108 on the edges of the legs or side walls 110 of the U-section. With particular reference to FIG. 11 it will be seen that the side walls 110 and flanges 108 incline upwardly a little as at 112 above the plane of the rearward or outward ends of the clips, so that the free ends of flanges 110 which are turned up slightly as at 114 press springably against the return bend terminal flanges 44 of the door stop rib 42. This yieldably and slidably holds the transverse flanges of the front jamb parts and rear jamb parts, as well as the header parts together. The clips are secured to the rear surfaces of the transverse flanges 40 as by welding at 116.

The modification shown in FIGS. 17 and 18 combines two of the front jamb parts 26A and B in opposed relation, rather than with a pair of front and rear parts. Similar construction is used on both sides of the doorway as well as in the header. The jamb part 26A has the same holding clip 106 as just described secured to its back side, but jamb part 26B has no clips. Instead, a parting strip 117 is tack welded as at 118 to the. rear side of flange 49 and terminal flange 44 to project transversely from the jamb member 26B and be slidably and variably received under the clips 106. The two jamb parts when thus assembled and secured to the wall as previously described will accommodate two communicating or oppositely opening double doors.

The spacing between the front and back frame parts may be varied to accommodate walls of different thicknesses.

FIGS. 18 and 19 also show a further modification form of the door frame. In addition to the previously mentioned notches or interruptions 65 in the outer trim retaining flanges 62A, the front jamb parts and header parts have elongated retaining strips 106A in place of the previously described clips 106. The strips 106A extend over or along the major portion of the lengths of the front jamb and front header parts. The strips are welded to the transverse flanges and 48 as at 120. The rear edges have outturned lips 122 which bear against the flanges 44 on the door stop ribs to yieldably receive and retain the forwardly projecting edges of the transverse flanges on the rear jamb and header parts when the parts are assembled. The strips 106A may be continuous for ease in attachment, but may obviously be divided into adjacent or spaced sections.

Various modifications and recombinations of details of the disclosed examples may be made without departing from the spirit of the invention as defined in the following claims:

What is claimed as new is:

rneans connecting said header parts in crossing relation over the upper ends of their respective jamb parts, i

1. A sheet metal frame for a door opening in a wall each of said parts having a wall engaging flange and a transversely turned flanged adapted to project into the door opening, the transversely turned flanges on said front jamb parts having door stop ribs of U-shaped cross section formed along the rear edges thereof and extending the full length of the jamb parts, the transversely turned flange on said front header part terminating short of the ends of the wall engaging flange thereof and overlying the transversely extending flanges of the front jamb parts and having a further shortened U-shaped door stop rib on its rear edge which abuts the transverse sides of the stop ribs on the front jamb parts. the transverse flanges on said rear jamb and rear header parts projecting forwardly in lapped relation over the outer sides of said door stop ribs, the wall engaging flanges of said parts having holes formed inwardly of their off-set edges to receive fasteners to be driven into the wall, outwardly off-set tongues extending downwardly from the overhanging ends of the wall engaging flanges on said header parts, outwardly off-set ribs extending as continuations of said tongues into the wall engaging flanges of the header parts and curved laterally inwardly across the tops of the transverse flanges on thc jamb parts, and outwardly off-set straps along the ends of the wall engaging flanges of the jamb parts forming slots retainingly receiving said tongues. 2. A metal frame for a doorway as defined in claim 1 in which the lower ends of the tongues on said header parts are slit laterally inwardly from each side and then downwardly to provide outwardly projecting tabs lockingly engageable under said straps on said jamb parts. 3. A metal frame for a doorway as defined in claim 1 in which the transverse flanges on said rear jamb parts have horizontal slits near the ends thereof forming other straps off-set outwardly of the door opening, and other depending tongues turned downwardly from the ends of the transverse flange of said rear header part retainingly received between said other straps and the transverse flanges of the rear jamb parts. 4. A metal frame for a doorway as defined in claim 1 in which the ends of the transverse flange on said front header part have rearwardly facing tabs thereon formed by rearwardly opening slots along the ends of the door stop rib of said front header part,

said tabs being bendable over the tops of the door stop ribs on said front jamb parts. 5. A metal frame for a doorway as defined in claim 1 in which the door stop ribs on said front jamb parts have forwardly turned flanges on their rear edges located in the same general planes as the forward portions of the transverse flanges on the front jamb parts, the ends of said forwardly turned flanges on said front header part having laterally projecting tabs thereon overlying the tops of the door stop ribs on said front jamb parts. 6. A sheet metal frame for a door opening in a wall comprising a pair of front jamb parts, a front header part, a pair of rear jamb parts, a rear header part,

each of said parts having a wall engaging flange and a transversely turned flange adapted to project into the door opening with wall engaging flanges of the header parts abutted against the tops of the wall flanges on the jamb parts,

the transversely turned flanges on said frontjamb the transverse flanges on said rear jamb parts projecting forwardly in lapped relation over the outer sides of said door stop ribs on said frontjamb parts,

the transverse flange on the other of said header parts overlying the door stop rib on said one of header parts, the wall engaging flanges of said parts having holes formed inwardly of their laterally outer edges to receive fasteners to be driven into the wall,

outwardly off-set tongues extending downwardly from the overhanging ends of the wall engaging flanges on said header parts, 7

outwardly off-set ribs extending as continuations 0 said tongues into the wall engaging flanges of the header parts and curved laterally inwardly across the ends of the transverse flanges on the header parts,

outwardly off-set straps along the ends of the wall engaging flanges of the jamb parts forming slots retainingly receiving said tongues,

other downwardly extending tongues on the ends of the transverse flange of said rear header part,

and second outwardly off-set straps on the ends of the transverse flanges on said rear jamb parts forming slots retainingly receiving said other downwardly extending tongues. 7. A metal door frame as defined in claim 6 in which the shortened door stop rib across the top of the frame is formed on the front header part,

the rear edge of said shortened door stop rib having a narrow forwardly turned flange thereon,

and a lug on each end of said narrow flange projecting laterally over the upper ends of the door stop ribs on said front jamb parts.

8. A metal door frame as defined in claim 7 in which there are U-shaped spring clips pressed downwardly over the upper ends of the door stop ribs on said front header parts with the bottoms of the clips bearing against the upper sides of the lower wall of the door stop rib on the front header part.

9. A metal door frame as defined in claim 7 in which the free edges of said wall engaging flanges are turned outwardly from the planes thereof,

outwardly protruding embossments formed in said wall engaging flanges in longitudinally aligned relation and inwardly of the holes therein and having free edges facing inwardly toward the door opening,

tabs on said last free edges projecting laterally toward the door opening,

and metal trim strips of U-shaped cross section fitted to all said parts,

said trim strips having inturned lips along their outer edges fitting retainingly behind the free edges of 7 the wall engaging flanges, and reversely curved springable flanges along their other edges springably engaged under said tabs on said protrusions.

10. A metal door frame as defined in claim 9 in which the outwardly turned free edges of said wall engaging flanges extend substantially continuously therealong.

11. A metal door frame as defined in claim 9 in which the outwardly turned free edges of said wall engaging flanges are interrupted and cut away opposite the fastener receiving holes therein.

12. A sheet metal frame for a door opening in a wall comprising a pair of front jamb parts,

a front header part,

a pair of rear jamb parts,

a rear header part,

each of said parts having a wall engaging flange and a transversely turned flange adapted to project into the door opening,

the transversely turned flanges on said front jamb parts having door stop ribs of U-shaped cross section formed along the rear edges thereof, the transversely turned flange on said front header part terminating short of the ends of the wall engaging flange thereof and overlying the transversely extending flanges of the front jamb parts and having a depending U-shaped door stop rib on its rear edge which abuts the ends of the stop ribs on the front jamb parts, the transverse flanges on said rear jamb and rear header parts projecting forwardly in lapped relation over the outer sides of said door stop ribs,

the wall engaging flanges of said parts having holes formed inwardly of their off-set edges to receive fasteners to be driven into the wall,

"'- outwardly off-set tongues extending downwardly from the overhanging ends of the wall engaging flanges on said header parts,

outwardly off-set straps along the ends of the wall engaging flanges of the jamb parts forming slots retainingly receiving said tongues on said header parts,

and U-shaped spring clips frictionally engaged over the ends of the transversely extending portion of part of said door stop ribs,

said clips extending into abutting and retaining engagement with the outer concealed surface of the door stop rib on the adjacent part.

13. The sheet metal frame for a door opening as defined in claim 12 in which the door stop ribs on said front jamb parts extend the full lengths thereof, and the door stop rib on said front header part is shorter than the header part, whereby the ends of the door stop rib on the header part abut the inwardly facing sides of the door stop ribs on said front jamb parts,

said spring clips being applied over the upper end of the door stop ribs on the front jamb parts.

14. A sheet metal frame for a door opening in a wall comprising a pair of front jamb parts,

a front header part,

a pair of rear jamb parts,

a rear header part,

each of said parts having a wall engaging flange adapted to be secured to a wall and a transversely turned flange adapted to project into the door opening,

the transversely turned flanges on said frontjamb and front header parts having door stop ribs of U- shaped cross section formed along the rear edges thereof,

and clip elements of U-shaped cross section facing said transverse flanges and having outturned flanges on the edges of the U-section welded to the outer sides of the transverse flanges of said front jamb and front header parts and projecting rearwardly across the stop ribs thereof and springably urged to engagement with the rear edges of said stop ribs,

the transverse flanges on said rear jamb and rear header parts projecting forwardly in lapped relation over the outer sides of said door stop ribs and being yieldably and slidably received between said clip elements and the outer rear edges of the stop ribs,

the outwardly turned flanges on said clips being offset outwardly of the frame behind the welded connections thereof, and inclined inwardly of the door opening to the rear edges of said doorstop ribs. 

1. A sheet metal frame for a door opening in a wall comprising a pair of front jamb parts, a front header part, a pair of rear jamb parts, a rear header part, means connecting said header parts in crossing relation over the upper ends of their respective jamb parts, each of said parts having a wall engaging flange and a transversely turned flanged adapted to project into the door opening, the transversely turned flanges on said front jamb parts having door stop ribs of U-shaped cross section formed along the rear edges thereof and extending the full length of the jamb parts, the transversely turned flange on said front header part terminating short of the ends of the wall engaging flange thereof and overlying the transversely extending flanges of the front jamb parts and having a further shortened U-shaped door stop rib on its rear edge which abuts the transverse sides of the stop ribs on the front jamb parts, the transverse flanges on said rear jamb and rear header parts projecting forwardly in lapped relation over the outer sides of said door stop ribs, the wall engaging flanges of said parts having holes formed inwardly of their off-set edges to receive fasteners to be driven into the wall, outwardly off-set tongues extending downwardly from the overhanging ends of the wall engaging flanges on said header parts, outwardly off-set ribs extending as continuations of said tongues into the wall engaging flanges of the header parts and curved laterally inwardly across the tops of the transverse flanges on the jamb parts, and outwardly off-set straps along the ends of the wall engaging flanges of the jamb parts forming slots retainingly receiving said tongues.
 2. A metal frame for a doorway as defined in claim 1 in which the lower ends of the tongues on said header parts are slit laterally inwardly from each side and then downwardly to provide outwardly projecting tabs lockingly engageable under said straps on said jamb parts.
 3. A metal frame for a doorway as defined in claim 1 in which the transverse flanges on said rear jamb parts have horizontal slits near the ends thereof forming other straps off-set outwardly of the door opening, and other depending tongues turned downwardly from the ends of the transverse flange of said rear header part retainingly received between said other straps and the transverse flanges of the rear jamb parts.
 4. A metal frame for a doorway as defined in claim 1 in which the ends of the transverse flange on said front header part have rearwardly facing tabs thereon formed by rearwardly opening slots along the ends of the door stop rib of said front header part, said tabs being bendable over the tops of the door stop ribs on said front jamb parts.
 5. A metal frame for a doorway as defined in claim 1 in which the door stop ribs on said front jamb parts have forwardly turned flanges on their rear edges located in the same general planes as the forward portions of the transverse flanges on the front jamb parts, the ends of said forwardly turned flanges on said front header part having laterally projecting tabs thereon overlying the tops of the door stop ribs on said front jamb parts.
 6. A sheet metal frame for a door opening in a wall comprising a pair of front jamb parts, a front header part, a pair of rear jamb parts, a rear header part, each of said parts having a wall engaging flange and a transversely turned flange adapted to project into the door opening with wall engaging flanges of the header parts abutted against the tops of the wall flanges on the jamb parts, the transversely turned flanges on said front jamb parts having door stop ribs of U-shaped cross section formed along the rear edges thereof and extending the full length of the jamb parts, a transversely turned flange on one of said header parts having a shortened U-shaped door stop rib on its free edge which abuts the transverse sides of the stop ribs on the front jamb parts, the transverse flanges on said rear jamb parts projecting forwardly in lapped relation over the outer sides of said door stop ribs on said front jamb parts, the transverse flange on the other of said header parts overlying the door stop rib on said one of header parts, the wall engaging flanges of said parts having holes formed inwardly of their laterally outer edges to receive fasteners to be driven into the wall, outwardly off-set tongues extending downwardly from the overhanging ends of the wall engaging flanges on said header parts, outwardly off-set ribs extending as continuations of said tongues into the wall engaging flanges of the header parts and curved laterally inwardly across the ends of the transverse flanges on the heaDer parts, outwardly off-set straps along the ends of the wall engaging flanges of the jamb parts forming slots retainingly receiving said tongues, other downwardly extending tongues on the ends of the transverse flange of said rear header part, and second outwardly off-set straps on the ends of the transverse flanges on said rear jamb parts forming slots retainingly receiving said other downwardly extending tongues.
 7. A metal door frame as defined in claim 6 in which the shortened door stop rib across the top of the frame is formed on the front header part, the rear edge of said shortened door stop rib having a narrow forwardly turned flange thereon, and a lug on each end of said narrow flange projecting laterally over the upper ends of the door stop ribs on said front jamb parts.
 8. A metal door frame as defined in claim 7 in which there are U-shaped spring clips pressed downwardly over the upper ends of the door stop ribs on said front header parts with the bottoms of the clips bearing against the upper sides of the lower wall of the door stop rib on the front header part.
 9. A metal door frame as defined in claim 7 in which the free edges of said wall engaging flanges are turned outwardly from the planes thereof, outwardly protruding embossments formed in said wall engaging flanges in longitudinally aligned relation and inwardly of the holes therein and having free edges facing inwardly toward the door opening, tabs on said last free edges projecting laterally toward the door opening, and metal trim strips of U-shaped cross section fitted to all said parts, said trim strips having inturned lips along their outer edges fitting retainingly behind the free edges of the wall engaging flanges, and reversely curved springable flanges along their other edges springably engaged under said tabs on said protrusions.
 10. A metal door frame as defined in claim 9 in which the outwardly turned free edges of said wall engaging flanges extend substantially continuously therealong.
 11. A metal door frame as defined in claim 9 in which the outwardly turned free edges of said wall engaging flanges are interrupted and cut away opposite the fastener receiving holes therein.
 12. A sheet metal frame for a door opening in a wall comprising a pair of front jamb parts, a front header part, a pair of rear jamb parts, a rear header part, each of said parts having a wall engaging flange and a transversely turned flange adapted to project into the door opening, the transversely turned flanges on said front jamb parts having door stop ribs of U-shaped cross section formed along the rear edges thereof, the transversely turned flange on said front header part terminating short of the ends of the wall engaging flange thereof and overlying the transversely extending flanges of the front jamb parts and having a depending U-shaped door stop rib on its rear edge which abuts the ends of the stop ribs on the front jamb parts, the transverse flanges on said rear jamb and rear header parts projecting forwardly in lapped relation over the outer sides of said door stop ribs, the wall engaging flanges of said parts having holes formed inwardly of their off-set edges to receive fasteners to be driven into the wall, outwardly off-set tongues extending downwardly from the overhanging ends of the wall engaging flanges on said header parts, outwardly off-set straps along the ends of the wall engaging flanges of the jamb parts forming slots retainingly receiving said tongues on said header parts, and U-shaped spring clips frictionally engaged over the ends of the transversely extending portion of part of said door stop ribs, said clips extending into abutting and retaining engagement with the outer concealed surface of the door stop rib on the adjacent part.
 13. The sheet metal frame for a door opening as defined in claim 12 in which the door stop ribs on said front jAmb parts extend the full lengths thereof, and the door stop rib on said front header part is shorter than the header part, whereby the ends of the door stop rib on the header part abut the inwardly facing sides of the door stop ribs on said front jamb parts, said spring clips being applied over the upper end of the door stop ribs on the front jamb parts.
 14. A sheet metal frame for a door opening in a wall comprising a pair of front jamb parts, a front header part, a pair of rear jamb parts, a rear header part, each of said parts having a wall engaging flange adapted to be secured to a wall and a transversely turned flange adapted to project into the door opening, the transversely turned flanges on said front jamb and front header parts having door stop ribs of U-shaped cross section formed along the rear edges thereof, and clip elements of U-shaped cross section facing said transverse flanges and having outturned flanges on the edges of the U-section welded to the outer sides of the transverse flanges of said front jamb and front header parts and projecting rearwardly across the stop ribs thereof and springably urged to engagement with the rear edges of said stop ribs, the transverse flanges on said rear jamb and rear header parts projecting forwardly in lapped relation over the outer sides of said door stop ribs and being yieldably and slidably received between said clip elements and the outer rear edges of the stop ribs, the outwardly turned flanges on said clips being off-set outwardly of the frame behind the welded connections thereof, and inclined inwardly of the door opening to the rear edges of said doorstop ribs. 